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Finding the Fourth Proportional to 87,092, 130,638.64 and 21,428

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Solution

The fourth proportional to 87,092, 130,638.64 and 21,428 is: 32,142.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,092 : 130,638.64 = 21,428 : x
  2. Step 2: Convert to fraction form
    87,092/130,638.64 = 21,428/x
  3. Step 3: Cross multiply
    87,092x = 130,638.64 × 21,428
  4. Step 4: Simplify right side
    87,092x = 2,799,324,777.92
  5. Step 5: Solve for x
    x = 2,799,324,777.92/87,092
  6. Step 6: Final answer
    x = 32,142.16

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.